Ultra-coherent semiconductor lasers for metrology

用于计量的超相干半导体激光器

基本信息

批准号：
2606685
负责人：
金额：
--
依托单位：
University of Strathclyde
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2606685
关键词：
Ultra coherent semiconductor lasers metrology

项目摘要

This project involves the development of compact and robust laser sources with the high performance required for metrology and quantum technology applications, enabled by the unique properties of hybrid semiconductor lasers: wavelength engineerable lasers with very high finesse cavities and ultra-narrow fundamental linewidth. Such lasers have very low intensity and frequency noise compared to other lasers so long as the photon lifetime exceeds the carrier lifetime; however, in conventional formats this means that the external cavity must be a few cm long and therefore subject to environmental noise. Linewidths below a few kHz are usually achieved via active stabilisation to an external reference, most often a Fabry-Perot. We have recently reported semiconductor disk lasers with sub-kHz linewidths at novel wavelengths for atom cooling applications, which is record performance for this laser type; however, to date we have used relatively standard free-space laser resonators, external frequency references, and standard locking schemes. These add bulk and complexity to a compact semiconductor laser system and are subject to drift. Having demonstrated the potential of these lasers for cold-atom metrology we will now take advantage of their low intrinsic noise and unique intracavity dynamics for much more compact frequency locking schemes.Aim: to apply a range of semiconductor and optical engineering techniques combined with novel laser architectures to significantly reduce the volume and improve the stability of ultra-coherent semiconductor laser systems for metrology.

该项目涉及开发紧凑而坚固的激光源，这些激光源具有计量和量子技术应用所需的高性能，这得益于混合半导体激光器的独特特性：具有极高精细腔和超窄基本线宽的波长可工程激光器。与其他激光器相比，只要光子寿命超过载流子寿命，此类激光器就具有非常低的强度和频率噪声；然而，在传统形式中，这意味着外腔必须有几厘米长，因此会受到环境噪音的影响。低于几kHz的线宽通常是通过外部参考（最常见的是法布里-珀罗参考）的主动稳定来实现。我们最近报道了用于原子冷却应用的新型波长下具有亚kHz线宽的半导体盘激光器，这是该激光器类型的创纪录的性能；然而，迄今为止，我们已经使用了相对标准的自由空间激光谐振器、外部频率参考和标准锁定方案。这些增加了紧凑型半导体激光系统的体积和复杂性，并且容易发生漂移。展示了这些激光器在冷原子计量方面的潜力后，我们现在将利用其低固有噪声和独特的腔内动力学来实现更紧凑的频率锁定方案。目标：应用一系列半导体和光学工程技术与新型激光器相结合显着减小体积并提高用于计量的超相干半导体激光系统的稳定性的架构。